Finding the Fourth Proportional to 22,449.16, 30,978.18 and 13,016.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,449.16 : 30,978.18 = 13,016.20 : x
2. Step 2: Convert to fraction form
   22,449.16/30,978.18 = 13,016.20/x
3. Step 3: Cross multiply
   22,449.16x = 30,978.18 × 13,016.20
4. Step 4: Simplify right side
   22,449.16x = 403,218,186.52
5. Step 5: Solve for x
   x = 403,218,186.52/22,449.16
6. Step 6: Final answer
   x = 17,961.39